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Analysis system

  • US 8,810,396 B2
  • Filed: 12/22/2009
  • Issued: 08/19/2014
  • Est. Priority Date: 12/22/2008
  • Status: Active Grant
First Claim
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1. An apparatus for analysing a condition of a machine having a first part which is rotationally movable at a speed of rotation in relation to a second machine part, said apparatus including:

  • a sensor for monitoring said movable part so as to generate at least one analogue measurement signal including at least one vibration signal component dependent on a vibration movement of said rotationally movable part;

    wherein said vibration signal component has a repetition frequency which depends on the speed of rotation of said first part;

    said measurement signal including noise as well as said vibration signal component so that said measurement signal has a first signal-to-noise ratio value in respect of said vibration signal component;

    an A/D-converter for generating a digital measurement data sequence in response to said measurement signal;

    said digital measurement data sequence having a first sample rate;

    a digital filter for generating a filtered measurement data signal in dependence on the digital measurement data sequence;

    a digital enveloper for producing an enveloped signal in response to the filtered measurement data signal;

    a decimator adapted to generate a decimated digital signal having a reduced sampling frequency dependent on said digitally enveloped signal;

    an enhancer having an input for receiving said decimated digital signal;

    said enhancer being adapted to produce an output signal sequence having a repetitive signal component corresponding to said at least one vibration signal component so that said output signal sequence has a second signal-to-noise ratio value in respect of said repetitive signal component;

    said second signal-to-noise ratio value being higher than said first signal-to-noise ratio value; and

    said enhancer being adapted to perform a correlation so as to produce said output signal sequence so that repetitive signal amplitude components are amplified in relation to stochastic signal components;

    whereina) said enhancer is adapted to receive a first plurality of sample values of said decimated digital signal via said input;

    b) said enhancer is adapted to store the received sample values in an input signal storage portion of a data memory associated with the enhancer;

    c) said enhancer is adapted to set a variable t to an initial value;

    d) said enhancer is adapted to calculate an output sample value SMDP(t) for the variable value t by employing the equation;

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